High-performance asymmetric supercapacitor based on 1T-MoS2 and MgAl-Layered double hydroxides

In this work, carbon fiber clothes (CFC) supported 1T phase MoS2 anode material is synthesized through a one-pot hydrothermal method. The CFC-MoS2 composites has high specific capacitance of 1485.08 Fg(-1) at the current density of 2 Ag-1, and the 54% of initial capacitance can be remained at the current density reached to 15 Ag-1. The 87.5% of initial capacitance can be harvested even at the ceaseless cycled for 10,000 cycles at 4 Ag-1. In addition, the MgAl layered double hydroxides and graphene oxide (MgAl-LDH-GO) cathode composite material is synthesized. The MgAl-LDH-GO cathode exhibits high specific capacitance (1208.50 Fg(-1) at 1 Ag-1) and long cycle life (76.9% retention during 10,000 cycles). Finally, we successfully assemble the CFC-MoS2//MgAl-LDH-GO asymmetric supercapacitor. It has high energy density of 326.54 Wh kg(-1) at power density of 1500 W kg(-1), and the energy density can be remained at 279.56 Wh kg(-1) even the power density reach to 12 kW kg(-1). This excellent performance satisfied the current demand of the high power and energy density. Thus, the lightweight (<0.25 mg/cm(2)), ultrathin (<0.8 mm), and the favourable electrochemical performance make it suitable for the next generation energy storage device. (C) 2019 Elsevier Ltd. All rights reserved.